Successful film roles also included a love struck student in the Sickan Carlsson film Klasskamrater (1952), Ernst in his own popular children's film Rasmus, Pontus och Toker (1956) and the scrubby old Potato-Algot in Jim och piraterna Blom (1987), directed by Hans Alfredson (from Hasse & Tage).

Rasmus, Pontus och Toker is a 1966 Swedish film directed by Stig Olin and written by Astrid Lindgren.

Olin then moved on to directing for both film and stage in the 1950s, 60s and 70s, focusing on comedies and musicals (including the original Swedish staging of Stephen Sondheim's A Little Night Music in 1978).